139 lines
4.0 KiB
C
139 lines
4.0 KiB
C
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#ifndef _LINUX_BPF_H
|
|
#define _LINUX_BPF_H 1
|
|
|
|
#include <uapi/linux/bpf.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/file.h>
|
|
|
|
struct bpf_map;
|
|
|
|
/* map is generic key/value storage optionally accesible by eBPF programs */
|
|
struct bpf_map_ops {
|
|
/* funcs callable from userspace (via syscall) */
|
|
struct bpf_map *(*map_alloc)(union bpf_attr *attr);
|
|
void (*map_free)(struct bpf_map *);
|
|
int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
|
|
|
|
/* funcs callable from userspace and from eBPF programs */
|
|
void *(*map_lookup_elem)(struct bpf_map *map, void *key);
|
|
int (*map_update_elem)(struct bpf_map *map, void *key, void *value);
|
|
int (*map_delete_elem)(struct bpf_map *map, void *key);
|
|
};
|
|
|
|
struct bpf_map {
|
|
atomic_t refcnt;
|
|
enum bpf_map_type map_type;
|
|
u32 key_size;
|
|
u32 value_size;
|
|
u32 max_entries;
|
|
struct bpf_map_ops *ops;
|
|
struct work_struct work;
|
|
};
|
|
|
|
struct bpf_map_type_list {
|
|
struct list_head list_node;
|
|
struct bpf_map_ops *ops;
|
|
enum bpf_map_type type;
|
|
};
|
|
|
|
void bpf_register_map_type(struct bpf_map_type_list *tl);
|
|
void bpf_map_put(struct bpf_map *map);
|
|
struct bpf_map *bpf_map_get(struct fd f);
|
|
|
|
/* function argument constraints */
|
|
enum bpf_arg_type {
|
|
ARG_DONTCARE = 0, /* unused argument in helper function */
|
|
|
|
/* the following constraints used to prototype
|
|
* bpf_map_lookup/update/delete_elem() functions
|
|
*/
|
|
ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
|
|
ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
|
|
ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
|
|
|
|
/* the following constraints used to prototype bpf_memcmp() and other
|
|
* functions that access data on eBPF program stack
|
|
*/
|
|
ARG_PTR_TO_STACK, /* any pointer to eBPF program stack */
|
|
ARG_CONST_STACK_SIZE, /* number of bytes accessed from stack */
|
|
|
|
ARG_ANYTHING, /* any (initialized) argument is ok */
|
|
};
|
|
|
|
/* type of values returned from helper functions */
|
|
enum bpf_return_type {
|
|
RET_INTEGER, /* function returns integer */
|
|
RET_VOID, /* function doesn't return anything */
|
|
RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */
|
|
};
|
|
|
|
/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
|
|
* to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
|
|
* instructions after verifying
|
|
*/
|
|
struct bpf_func_proto {
|
|
u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
|
|
bool gpl_only;
|
|
enum bpf_return_type ret_type;
|
|
enum bpf_arg_type arg1_type;
|
|
enum bpf_arg_type arg2_type;
|
|
enum bpf_arg_type arg3_type;
|
|
enum bpf_arg_type arg4_type;
|
|
enum bpf_arg_type arg5_type;
|
|
};
|
|
|
|
/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
|
|
* the first argument to eBPF programs.
|
|
* For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
|
|
*/
|
|
struct bpf_context;
|
|
|
|
enum bpf_access_type {
|
|
BPF_READ = 1,
|
|
BPF_WRITE = 2
|
|
};
|
|
|
|
struct bpf_verifier_ops {
|
|
/* return eBPF function prototype for verification */
|
|
const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id);
|
|
|
|
/* return true if 'size' wide access at offset 'off' within bpf_context
|
|
* with 'type' (read or write) is allowed
|
|
*/
|
|
bool (*is_valid_access)(int off, int size, enum bpf_access_type type);
|
|
};
|
|
|
|
struct bpf_prog_type_list {
|
|
struct list_head list_node;
|
|
struct bpf_verifier_ops *ops;
|
|
enum bpf_prog_type type;
|
|
};
|
|
|
|
void bpf_register_prog_type(struct bpf_prog_type_list *tl);
|
|
|
|
struct bpf_prog;
|
|
|
|
struct bpf_prog_aux {
|
|
atomic_t refcnt;
|
|
bool is_gpl_compatible;
|
|
enum bpf_prog_type prog_type;
|
|
struct bpf_verifier_ops *ops;
|
|
struct bpf_map **used_maps;
|
|
u32 used_map_cnt;
|
|
struct bpf_prog *prog;
|
|
struct work_struct work;
|
|
};
|
|
|
|
void bpf_prog_put(struct bpf_prog *prog);
|
|
struct bpf_prog *bpf_prog_get(u32 ufd);
|
|
/* verify correctness of eBPF program */
|
|
int bpf_check(struct bpf_prog *fp, union bpf_attr *attr);
|
|
|
|
#endif /* _LINUX_BPF_H */
|